I had the same problem and found a possible solution. Open your network adapter's properties and click VMware Bridge Protocol.
Now here's the catch. If you try to reinstall it, it tells you it's marked for deletion. Since I'm still getting used to Windows 7 and all it's quirky newness, I simply rebooted the machine then went back into the network adapter's properties and installed VMware Bridge Protocol and started the WMware Agent service.
NOTE: Make sure you are not running any of your VM's while doing this or you will have problems with your Network adapter trying to find the network.
Basic instructions can be found here:
The instructions are basically for Windows XP. Skip the parts about Linux, of course.
If that doesn't work, I've found that rebooting the VM usually fixes it for a little while. It's really weird.